Marker for plastic part forming moulds

ABSTRACT

Said marker consists of three parts: an annular, enveloping body that is fixed in the location of the mold; an equally annular intermediate body that is rotatably mounted inside the first body and a central axle that is mounted inside the intermediate body and which can rotate relative to said body. Each of the three above-mentioned parts is provided with signaling means. Two narrow annular locations are disposed in the area of the marker opposite the operative front, wherein a helicoidal spring ending in a lug is placed in each of said locations. The lug of the outer spring is the single actuation control of the marker while the lug of the inner spring exhibits play in a small location of the intermediate body. Both spring are oppositely coiled in such a way that strangling of one of the springs takes place simultaneously while the other spring is being released.

OBJECT OF THE INVENTION

[0001] The present invention refers to a marker of the type used inmarking plastic parts, during the forming process thereof, in the coreof an injection or blowing mould.

[0002] The object of the invention is to enhance the marking capacitythereof, specifically to increase the number of variables the marker maymark with maximum operational capacity.

BACKGROUND OF THE INVENTION

[0003] When manufacturing a plastic part in a moulding process, it isnormal to establish in the same, different types of references of avariable character, like, for example, the part moulding date,specifically determining the month and year when the part wasmanufactured.

[0004] Current markers have a fixed body, conveniently fitted in a mouldhousing, said fixed body adopting a tubular configuration, such that inthe core thereof, there is a mobile nucleus, capable of varying itsangular position with respect to the fixed body. In the aforementionedexample of practical use, the use of the marker as a date marker, in thefront of the fixed body the reliefs or bas-reliefs corresponding to themonths of the year are established, in circumferential alignment and inthe mobile nucleus, besides establishing a marking arrow for one of saidmonths, the relief or bas-relief corresponding to the year.

[0005] This means that each year the marker should be released from themould, to eliminate the mobile nucleus and replace it by anothersuitable one for the new year.

DESCRIPTION OF THE INVENTION

[0006] The marker proposed by the invention satisfactorily resolves thisproblem permitting, in the aforementioned case, its use for a longperiod of time, like for example, ten years, without the need to replaceany of the parts.

[0007] For this purpose and more specifically, the marker consists ofthree basic parts, an annular, enveloping body that is fixed in thecorresponding location of the mould, an annular rotational andintermediate body and a central core which is also mobile androtational.

[0008] According to this structure and in the aforementioned example ofpractical embodiment, in the front of the central core, there will be,for example, a signalling arrow, in the front of the annular androtational body, the months of the year and a second indicating arrowand on the fixed and enveloping body, a series of successive years, suchthat by the suitable, relative positioning between the three partsintegrating the marker, any month of any of the years appearing on theenveloping body may be signalled.

[0009] According to another feature of the invention and to facilitateboth the stability of the mobile parts in the position selected forthem, and to facilitate handling of the marker, it has been foreseenthat between the enveloping and intermediate bodies, there is ahelicoidal spring and between the intermediate body and the centralcore, a second helicoidal spring, the first fixed by means of one of itsends to a cover closing the fixed and enveloping body at its endopposite the marker itself, and which constitutes the single activationcomponent of the marker, and the second to the intermediate annularbody, with the special feature that said springs have opposite windingdirections, such that when they act over the cover-control in adetermined rotation direction, one of the springs tends to be strangledover the intermediate body, provoking the dragging thereof, whilst theother one tends to be radially expanded, becoming inoperative withrespect to the central core, such that when it acts over saidcover-control in an opposite direction, the effect is also opposite,producing the dragging of the central axle or body and maintaining theintermediate rotational body static. Therefore, by means of the rotationof the cover-control in one direction, the signalling of the month isobtained and the signalling of the year is obtained by means of therotation of the opposite sign.

DESCRIPTION OF THE DRAWINGS

[0010] To complete the description being made and to permit a betterunderstanding of the features of the invention according to a preferredexample of practical embodiment thereof, said description is accompaniedby a set of drawings which show the following with an illustrative andnon-limiting character.

[0011]FIG. 1 shows an axial view of a marker for plastic part formingmoulds, carried out according to the object of the present invention,according to said example of practical embodiment in which said markeris destined to signal the part manufacturing date.

[0012]FIG. 2 shows a side elevation view and in diametric section of thesame marker.

PREFERRED EMBODIMENT OF THE INVENTION

[0013] In the light of the indicated figures and especially in FIG. 2,it may be observed how the marker being described is constituted as froman annular fixed and enveloping body (1), destined to be convenientlyinserted in the mould body, so that its front (2) remains levelled withthe internal surface thereof, a body provided with an internal andintermediate staging (3) with functions of penetration limiting stopsfor a second annular body (4), in this case, rotational, whose front(5), in turn remains levelled with the front (2) of the body (1) andwhich is also provided with perimetric and internal staging (6) withfunctions of stops for the central axle or core (7), for such a purposeprovided with an intermediate expansion (8) and the axle (7) end (9)likewise being coplanar with the fronts (2) and (5) of the annularbodies (1) and (4).

[0014] In the front (6) of the axle (7) there is, for example, asignalling arrow (10), in the front (5) of the annular intermediate body(4), there is signalling (11) corresponding to the months of the yearand in front (2) of the fixed body (1) signalling (12) is establishedcorresponding to a series of successive years, like for example, tenyears in the example of the practical embodiment of FIG. 1.

[0015] As a complement of the structure described between the annularenveloping body (1) and the annular, intermediate, rotating body (4),there is a small chamber (13), also annular, in which a helicoidalspring (14) is housed, while between said annular, intermediate body (4)and the central axle (7) another chamber (15) is defined, in which asecond helicoidal spring (16) is housed. The spring (14) is finished ina lug (17) which fits in a housing (18) of a cover (19) which closesbelow the fixed body (1), while the spring (16) is in turn finished in alug (20) coupled in the housing (21) of the intermediate body (5), withthe special particularity that these springs are coiled in oppositedirections, such that rotation in a given direction for the cover (19),in single command functions, provokes the strangling of the spring (14)against the intermediate body (5) and the resulting fixing between thesecomponents, whilst the spring (16) due to its different windingdirection, releases the axle (7), whilst when activation is produced inan opposite direction the spring (14) releases the intermediatediscoidal body (5), while the spring (16) is strangled over the axle(7), which is blocked, provoking the dragging thereof.

[0016] This implies that, with a single command (19), on actuating in arotation direction, the positional adjustment of the arrow (10) isobtained with respect to the marking (11) and, on actuating over thecommand (19) in an opposite direction, the marking of the arrow (10)over the signalling (12) is obtained, that is the marking of both themonth and year corresponding to the part manufacturing date.

1.- A marker for plastic part forming moulds, which on beingindistinctly useful in injection and blowing moulds and destined tobeing inserted in the mould housing, such that the front of the markeris coplanar with the internal surface of said mould, to transmit anytype of relevant signalling to the part, characterised on beingconstituted by the functional combination of three parts, an annularenveloping body, destined to be statically established in the mouldhousing, an intermediate body, also annular and housed, with possibilityof rotation within the first body and a central axle or body, in turnassembled inside the intermediate body and with possibility of rotationwith respect to the latter, each one of the three mentioned partsincorporating on their front duly combinable signalling means. 2.- Amarker for plastic part forming moulds according to claim 1,characterised in that in the marker area opposite the operative frontthereof, there are two narrow annular housings, one between theenveloping and intermediate bodies and another between the intermediatebody and the central axle or core, there being in each one of thesehousings, a helicoidal spring, the external spring being finished in acoupling lug to a cover closing the fixed and enveloping body andconstituting the single actuation command of the marker, while theinternal spring is in turn finished in a lug acting in a small housingof the intermediate body, it having been foreseen that said springs arecoiled in opposite directions, such that in the rotational movement ofthe command in a determined direction, strangling is produced of one ofthe springs over one of the mobile parts and the release of the otherspring with respect to the other mobile part, whilst when said commandrotates in an opposite direction, likewise an opposite effect occurs, sothat the single command permits the central axle or core to bepositionally adjusted with respect to the intermediate body and then, bymeans of rotation in the opposite direction, to positionally adjust thetwo mobile parts with respect to the annular fixed and enveloping body.